<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:af45d13d-2fc7-4681-8859-301e3eaf9518,g:e73a34c6-1132-49e2-98a8-204a321ff3f0-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:cbz="http://www.cbiz.com/20250331" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types1="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2022-03-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.cbiz.com/20250331">
  <xs:import namespace="http://fasb.org/srt/2024" schemaLocation="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2024" schemaLocation="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2024" schemaLocation="https://xbrl.sec.gov/dei/2024/dei-2024.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2024" schemaLocation="https://xbrl.sec.gov/ecd/2024/ecd-2024.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cbz-20250331_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cbz-20250331_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cbz-20250331_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cbz-20250331_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="COVER" roleURI="http://www.cbiz.com/role/COVER">
        <link:definition>0000001 - Document - COVER</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDBALANCESHEETSUnaudited" roleURI="http://www.cbiz.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUnaudited">
        <link:definition>9952151 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUnaudited" roleURI="http://www.cbiz.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUnaudited">
        <link:definition>9952152 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUnaudited" roleURI="http://www.cbiz.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUnaudited">
        <link:definition>9952153 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS&#8217; EQUITY (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited" roleURI="http://www.cbiz.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited">
        <link:definition>9952154 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" roleURI="http://www.cbiz.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES">
        <link:definition>9952155 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NEWACCOUNTINGPRONOUNCEMENTS" roleURI="http://www.cbiz.com/role/NEWACCOUNTINGPRONOUNCEMENTS">
        <link:definition>9952156 - Disclosure - NEW ACCOUNTING PRONOUNCEMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BUSINESSCOMBINATIONS" roleURI="http://www.cbiz.com/role/BUSINESSCOMBINATIONS">
        <link:definition>9952157 - Disclosure - BUSINESS COMBINATIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCOUNTSRECEIVABLENET" roleURI="http://www.cbiz.com/role/ACCOUNTSRECEIVABLENET">
        <link:definition>9952158 - Disclosure - ACCOUNTS RECEIVABLE, NET</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBTANDFINANCINGARRANGEMENTS" roleURI="http://www.cbiz.com/role/DEBTANDFINANCINGARRANGEMENTS">
        <link:definition>9952159 - Disclosure - DEBT AND FINANCING ARRANGEMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMMITMENTSANDCONTINGENCIES" roleURI="http://www.cbiz.com/role/COMMITMENTSANDCONTINGENCIES">
        <link:definition>9952160 - Disclosure - COMMITMENTS AND CONTINGENCIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FINANCIALINSTRUMENTS" roleURI="http://www.cbiz.com/role/FINANCIALINSTRUMENTS">
        <link:definition>9952161 - Disclosure - FINANCIAL INSTRUMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTS" roleURI="http://www.cbiz.com/role/FAIRVALUEMEASUREMENTS">
        <link:definition>9952162 - Disclosure - FAIR VALUE MEASUREMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OTHERCOMPREHENSIVEINCOME" roleURI="http://www.cbiz.com/role/OTHERCOMPREHENSIVEINCOME">
        <link:definition>9952163 - Disclosure - OTHER COMPREHENSIVE INCOME</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESTOCKPLANS" roleURI="http://www.cbiz.com/role/EMPLOYEESTOCKPLANS">
        <link:definition>9952164 - Disclosure - EMPLOYEE STOCK PLANS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHARE" roleURI="http://www.cbiz.com/role/EARNINGSPERSHARE">
        <link:definition>9952165 - Disclosure - EARNINGS PER SHARE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTDISCLOSURES" roleURI="http://www.cbiz.com/role/SEGMENTDISCLOSURES">
        <link:definition>9952166 - Disclosure - SEGMENT DISCLOSURES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SUBSEQUENTEVENTS" roleURI="http://www.cbiz.com/role/SUBSEQUENTEVENTS">
        <link:definition>9952167 - Disclosure - SUBSEQUENT EVENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" roleURI="http://www.cbiz.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies">
        <link:definition>9955511 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BUSINESSCOMBINATIONSTables" roleURI="http://www.cbiz.com/role/BUSINESSCOMBINATIONSTables">
        <link:definition>9955512 - Disclosure - BUSINESS COMBINATIONS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCOUNTSRECEIVABLENETTables" roleURI="http://www.cbiz.com/role/ACCOUNTSRECEIVABLENETTables">
        <link:definition>9955513 - Disclosure - ACCOUNTS RECEIVABLE, NET (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBTANDFINANCINGARRANGEMENTSTables" roleURI="http://www.cbiz.com/role/DEBTANDFINANCINGARRANGEMENTSTables">
        <link:definition>9955514 - Disclosure - DEBT AND FINANCING ARRANGEMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FINANCIALINSTRUMENTSTables" roleURI="http://www.cbiz.com/role/FINANCIALINSTRUMENTSTables">
        <link:definition>9955515 - Disclosure - FINANCIAL INSTRUMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTSTables" roleURI="http://www.cbiz.com/role/FAIRVALUEMEASUREMENTSTables">
        <link:definition>9955516 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OTHERCOMPREHENSIVEINCOMETables" roleURI="http://www.cbiz.com/role/OTHERCOMPREHENSIVEINCOMETables">
        <link:definition>9955517 - Disclosure - OTHER COMPREHENSIVE INCOME (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESTOCKPLANSTables" roleURI="http://www.cbiz.com/role/EMPLOYEESTOCKPLANSTables">
        <link:definition>9955518 - Disclosure - EMPLOYEE STOCK PLANS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHARETables" roleURI="http://www.cbiz.com/role/EARNINGSPERSHARETables">
        <link:definition>9955519 - Disclosure - EARNINGS PER SHARE (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTDISCLOSURESTables" roleURI="http://www.cbiz.com/role/SEGMENTDISCLOSURESTables">
        <link:definition>9955520 - Disclosure - SEGMENT DISCLOSURES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails" roleURI="http://www.cbiz.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails">
        <link:definition>9955521 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BUSINESSCOMBINATIONSAdditionalInformationDetails" roleURI="http://www.cbiz.com/role/BUSINESSCOMBINATIONSAdditionalInformationDetails">
        <link:definition>9955522 - Disclosure - BUSINESS COMBINATIONS - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BUSINESSCOMBINATIONSSummaryofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails" roleURI="http://www.cbiz.com/role/BUSINESSCOMBINATIONSSummaryofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails">
        <link:definition>9955523 - Disclosure - BUSINESS COMBINATIONS - Summary of Recognized Identified Assets Acquired and Liabilities Assumed (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCOUNTSRECEIVABLENETSummaryofAccountsReceivableNetDetails" roleURI="http://www.cbiz.com/role/ACCOUNTSRECEIVABLENETSummaryofAccountsReceivableNetDetails">
        <link:definition>9955524 - Disclosure - ACCOUNTS RECEIVABLE, NET - Summary of Accounts Receivable, Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCOUNTSRECEIVABLENETSummaryofChangestotheAllowanceforDoubtfulAccountsonAccountsReceivableDetails" roleURI="http://www.cbiz.com/role/ACCOUNTSRECEIVABLENETSummaryofChangestotheAllowanceforDoubtfulAccountsonAccountsReceivableDetails">
        <link:definition>9955525 - Disclosure - ACCOUNTS RECEIVABLE, NET - Summary of Changes to the Allowance for Doubtful Accounts on Accounts Receivable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBTANDFINANCINGARRANGEMENTSAdditionalInformationDetails" roleURI="http://www.cbiz.com/role/DEBTANDFINANCINGARRANGEMENTSAdditionalInformationDetails">
        <link:definition>9955526 - Disclosure - DEBT AND FINANCING ARRANGEMENTS - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBTANDFINANCINGARRANGEMENTSSummaryofClassificationBetweenShortTermandLongTermDebtDetails" roleURI="http://www.cbiz.com/role/DEBTANDFINANCINGARRANGEMENTSSummaryofClassificationBetweenShortTermandLongTermDebtDetails">
        <link:definition>9955527 - Disclosure - DEBT AND FINANCING ARRANGEMENTS - Summary of Classification Between Short-Term and Long-Term Debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBTANDFINANCINGARRANGEMENTSSummaryofUnsecuredCreditFacilityDetails" roleURI="http://www.cbiz.com/role/DEBTANDFINANCINGARRANGEMENTSSummaryofUnsecuredCreditFacilityDetails">
        <link:definition>9955528 - Disclosure - DEBT AND FINANCING ARRANGEMENTS - Summary of Unsecured Credit Facility (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMMITMENTSANDCONTINGENCIESLettersofCreditandGuaranteesNarrativeDetails" roleURI="http://www.cbiz.com/role/COMMITMENTSANDCONTINGENCIESLettersofCreditandGuaranteesNarrativeDetails">
        <link:definition>9955529 - Disclosure - COMMITMENTS AND CONTINGENCIES - Letters of Credit and Guarantees (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMMITMENTSANDCONTINGENCIESLegalProceedingsNarrativeDetails" roleURI="http://www.cbiz.com/role/COMMITMENTSANDCONTINGENCIESLegalProceedingsNarrativeDetails">
        <link:definition>9955530 - Disclosure - COMMITMENTS AND CONTINGENCIES - Legal Proceedings (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FINANCIALINSTRUMENTSAdditionalInformationDetails" roleURI="http://www.cbiz.com/role/FINANCIALINSTRUMENTSAdditionalInformationDetails">
        <link:definition>9955531 - Disclosure - FINANCIAL INSTRUMENTS - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FINANCIALINSTRUMENTSSummaryofActivitiesRelatedtoInvestmentsDetails" roleURI="http://www.cbiz.com/role/FINANCIALINSTRUMENTSSummaryofActivitiesRelatedtoInvestmentsDetails">
        <link:definition>9955532 - Disclosure - FINANCIAL INSTRUMENTS - Summary of Activities Related to Investments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FINANCIALINSTRUMENTSSummaryofOutstandingInterestRateSwapsDetails" roleURI="http://www.cbiz.com/role/FINANCIALINSTRUMENTSSummaryofOutstandingInterestRateSwapsDetails">
        <link:definition>9955533 - Disclosure - FINANCIAL INSTRUMENTS - Summary of Outstanding Interest Rate Swaps (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FINANCIALINSTRUMENTSSummaryofEffectsofInterestRateSwapDetails" roleURI="http://www.cbiz.com/role/FINANCIALINSTRUMENTSSummaryofEffectsofInterestRateSwapDetails">
        <link:definition>9955534 - Disclosure - FINANCIAL INSTRUMENTS - Summary of Effects of Interest Rate Swap (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTSSummaryofAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" roleURI="http://www.cbiz.com/role/FAIRVALUEMEASUREMENTSSummaryofAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails">
        <link:definition>9955535 - Disclosure - FAIR VALUE MEASUREMENTS - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTSSummaryofChangeinLevel3FairValuesofContingentPurchasePriceLiabilitiesDetails" roleURI="http://www.cbiz.com/role/FAIRVALUEMEASUREMENTSSummaryofChangeinLevel3FairValuesofContingentPurchasePriceLiabilitiesDetails">
        <link:definition>9955536 - Disclosure - FAIR VALUE MEASUREMENTS - Summary of Change in Level 3 Fair Values of Contingent Purchase Price Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTSSummaryofChangesinContingentPurchasePriceConsiderationDetails" roleURI="http://www.cbiz.com/role/FAIRVALUEMEASUREMENTSSummaryofChangesinContingentPurchasePriceConsiderationDetails">
        <link:definition>9955537 - Disclosure - FAIR VALUE MEASUREMENTS - Summary of Changes in Contingent Purchase Price Consideration (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OTHERCOMPREHENSIVEINCOMEDetails" roleURI="http://www.cbiz.com/role/OTHERCOMPREHENSIVEINCOMEDetails">
        <link:definition>9955538 - Disclosure - OTHER COMPREHENSIVE INCOME (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESTOCKPLANSAdditionalInformationDetails" roleURI="http://www.cbiz.com/role/EMPLOYEESTOCKPLANSAdditionalInformationDetails">
        <link:definition>9955539 - Disclosure - EMPLOYEE STOCK PLANS - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESTOCKPLANSSummaryofCompensationExpenseforStockBasedAwardsDetails" roleURI="http://www.cbiz.com/role/EMPLOYEESTOCKPLANSSummaryofCompensationExpenseforStockBasedAwardsDetails">
        <link:definition>9955540 - Disclosure - EMPLOYEE STOCK PLANS - Summary of Compensation Expense for Stock-Based Awards (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESTOCKPLANSSummaryofRestrictedStockUnitsandAwardsActivityDetails" roleURI="http://www.cbiz.com/role/EMPLOYEESTOCKPLANSSummaryofRestrictedStockUnitsandAwardsActivityDetails">
        <link:definition>9955541 - Disclosure - EMPLOYEE STOCK PLANS - Summary of Restricted Stock Units and Awards Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESTOCKPLANSSummaryofPerformanceShareUnitsActivityDetails" roleURI="http://www.cbiz.com/role/EMPLOYEESTOCKPLANSSummaryofPerformanceShareUnitsActivityDetails">
        <link:definition>9955542 - Disclosure - EMPLOYEE STOCK PLANS - Summary of Performance Share Units Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHAREDetails" roleURI="http://www.cbiz.com/role/EARNINGSPERSHAREDetails">
        <link:definition>9955543 - Disclosure - EARNINGS PER SHARE (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTDISCLOSURESAdditionalInformationDetails" roleURI="http://www.cbiz.com/role/SEGMENTDISCLOSURESAdditionalInformationDetails">
        <link:definition>9955544 - Disclosure - SEGMENT DISCLOSURES - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTDISCLOSURESSummaryofSegmentInformationDetails" roleURI="http://www.cbiz.com/role/SEGMENTDISCLOSURESSummaryofSegmentInformationDetails">
        <link:definition>9955545 - Disclosure - SEGMENT DISCLOSURES - Summary of Segment Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTDISCLOSURESSummaryofSegmentInformationDetails_1" roleURI="http://www.cbiz.com/role/SEGMENTDISCLOSURESSummaryofSegmentInformationDetails_1">
        <link:definition>9955545 - Disclosure - SEGMENT DISCLOSURES - Summary of Segment Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SUBSEQUENTEVENTSDetails" roleURI="http://www.cbiz.com/role/SUBSEQUENTEVENTSDetails">
        <link:definition>9955546 - Disclosure - SUBSEQUENT EVENTS (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="cbz_CurrentAssetsBeforeFundsHeldForClients" abstract="false" name="CurrentAssetsBeforeFundsHeldForClients" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_CurrentLiabilitiesBeforeClientFundObligations" abstract="false" name="CurrentLiabilitiesBeforeClientFundObligations" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_ClientFundObligations" abstract="false" name="ClientFundObligations" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_RestrictedStockUnitsAndAwardsMember" abstract="true" name="RestrictedStockUnitsAndAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_ProvisionForDoubtfulAccountsNetOfRecoveries" abstract="false" name="ProvisionForDoubtfulAccountsNetOfRecoveries" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_NetIncreaseDecreaseInFundsHeldForClientsInvesting" abstract="false" name="NetIncreaseDecreaseInFundsHeldForClientsInvesting" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_NetIncreaseDecreaseInClientFundsObligationsFinancing" abstract="false" name="NetIncreaseDecreaseInClientFundsObligationsFinancing" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_PaymentOfContingentConsiderationOfAcquisitions" abstract="false" name="PaymentOfContingentConsiderationOfAcquisitions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_ReconciliationOfCashCashEquivalentsAndRestrictedCashToConsolidatedBalanceSheetAbstract" abstract="true" name="ReconciliationOfCashCashEquivalentsAndRestrictedCashToConsolidatedBalanceSheetAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cbz_CashEquivalentsIncludedInFundsHeldForClients" abstract="false" name="CashEquivalentsIncludedInFundsHeldForClients" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_DescriptionOfBusinessPolicyPolicyTextBlock" abstract="false" name="DescriptionOfBusinessPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="cbz_ChangesInAccountingPolicyPolicyTextBlock" abstract="false" name="ChangesInAccountingPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="cbz_ScheduleOfChangesInAllowanceForDoubtfulAccountsTableTextBlock" abstract="false" name="ScheduleOfChangesInAllowanceForDoubtfulAccountsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="cbz_SummaryOfEffectsOfInterestRateSwapsTableTextBlock" abstract="false" name="SummaryOfEffectsOfInterestRateSwapsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="cbz_NumberOfPracticeGroups" abstract="false" name="NumberOfPracticeGroups" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cbz_MarcumLLPAcquisitionMember" abstract="true" name="MarcumLLPAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cbz_BusinessAcquisitionEquityInterestRemainingNumberOfSharesIssuable" abstract="false" name="BusinessAcquisitionEquityInterestRemainingNumberOfSharesIssuable" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cbz_BusinessAcquisitionEquityInterestNumberOfMonthlyInstallmentsForRemainingSharesIssuable" abstract="false" name="BusinessAcquisitionEquityInterestNumberOfMonthlyInstallmentsForRemainingSharesIssuable" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cbz_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiability" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetsAndLiabilities" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetsAndLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsUnbilledRevenue" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsUnbilledRevenue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedPersonnelCosts" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedPersonnelCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_AllowanceForDoubtfulAccountsReceivableWriteOffsAndNetOfRecoveries" abstract="false" name="AllowanceForDoubtfulAccountsReceivableWriteOffsAndNetOfRecoveries" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_A2024CreditFacilitiesMember" abstract="true" name="A2024CreditFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cbz_DebtInstrumentAnnualPrincipalAmortizationPaymentsRateYearsOneAndTwo" abstract="false" name="DebtInstrumentAnnualPrincipalAmortizationPaymentsRateYearsOneAndTwo" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cbz_DebtInstrumentAnnualPrincipalAmortizationPaymentsRateYearsThreeAndFour" abstract="false" name="DebtInstrumentAnnualPrincipalAmortizationPaymentsRateYearsThreeAndFour" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cbz_DebtInstrumentAnnualPrincipalAmortizationPaymentsRateYearFive" abstract="false" name="DebtInstrumentAnnualPrincipalAmortizationPaymentsRateYearFive" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cbz_DebtInstrumentCovenantLeverageRatioMaximumTrancheOne" abstract="false" name="DebtInstrumentCovenantLeverageRatioMaximumTrancheOne" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="cbz_DebtInstrumentCovenantLeverageRatioMaximumTrancheTwo" abstract="false" name="DebtInstrumentCovenantLeverageRatioMaximumTrancheTwo" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="cbz_DebtInstrumentCovenantInterestCoverageRatioMinimum" abstract="false" name="DebtInstrumentCovenantInterestCoverageRatioMinimum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="cbz_LicenseBondsOutstandingAmount" abstract="false" name="LicenseBondsOutstandingAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_CommitmentsAndContingenciesTable" abstract="true" name="CommitmentsAndContingenciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="cbz_CBIZOperationsAndFormerEmployeeOfCBIZMMPMember" abstract="true" name="CBIZOperationsAndFormerEmployeeOfCBIZMMPMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_MOVEitCustomerDataSecurityBreachLitigationMember" abstract="true" name="MOVEitCustomerDataSecurityBreachLitigationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cbz_CommitmentsAndContingenciesLineItems" abstract="true" name="CommitmentsAndContingenciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cbz_TransactionPrice" abstract="false" name="TransactionPrice" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_CertifiedDepositsAndOtherDepositoryAssetsMember" abstract="true" name="CertifiedDepositsAndOtherDepositoryAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_DebtSecuritiesAvailableForSaleRollForward" abstract="true" name="DebtSecuritiesAvailableForSaleRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cbz_IncreaseDecreaseInBondPremium" abstract="false" name="IncreaseDecreaseInBondPremium" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_AvailableForSaleSecuritiesDebtSecuritiesFairMarketValueAdjustment" abstract="false" name="AvailableForSaleSecuritiesDebtSecuritiesFairMarketValueAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_InterestRateSwapApril2025ExpirationMember" abstract="true" name="InterestRateSwapApril2025ExpirationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_InterestRateSwapDecember2026ExpirationMember" abstract="true" name="InterestRateSwapDecember2026ExpirationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_InterestRateSwapAugust2027ExpirationMember" abstract="true" name="InterestRateSwapAugust2027ExpirationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_InterestRateSwapApril2028ExpirationMember" abstract="true" name="InterestRateSwapApril2028ExpirationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_InterestRateSwapOctober2028ExpirationMember" abstract="true" name="InterestRateSwapOctober2028ExpirationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cbz_InterestRateSwapMarch2030ExpirationMember" abstract="true" name="InterestRateSwapMarch2030ExpirationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cbz_ContingentPurchasePriceLiabilitiesAtFairValue" abstract="false" name="ContingentPurchasePriceLiabilitiesAtFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_ContingentPurchasePricePayableMember" abstract="true" name="ContingentPurchasePricePayableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityChangeInNetPresentValueOfContingencies" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityChangeInNetPresentValueOfContingencies" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_BusinessCombinationContingentConsiderationLiabilityOtherAdjustmentsBasedOnProjectedFutureResultsOfAcquisition" abstract="false" name="BusinessCombinationContingentConsiderationLiabilityOtherAdjustmentsBasedOnProjectedFutureResultsOfAcquisition" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_NumberOfCommonSharesIssued" abstract="false" name="NumberOfCommonSharesIssued" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cbz_TwoThousandNineteenStockOmnibusIncentivePlanMember" abstract="true" name="TwoThousandNineteenStockOmnibusIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalSharesAuthorizedForIssuance" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalSharesAuthorizedForIssuance" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentageOfTargetEarningsPerShare" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentageOfTargetEarningsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceStockOfTotalGrowthInRevenue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceStockOfTotalGrowthInRevenue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="cbz_ShareBasedCompensationArrangementsByShareBasedPaymentAwardPerformanceStockPercentageOfInitialGrantTrancheOne" abstract="false" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardPerformanceStockPercentageOfInitialGrantTrancheOne" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="cbz_ShareBasedCompensationArrangementsByShareBasedPaymentAwardPerformanceStockPercentageOfInitialGrantTrancheTwo" abstract="false" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardPerformanceStockPercentageOfInitialGrantTrancheTwo" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cbz_PerformanceShareUnits" abstract="false" name="PerformanceShareUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsForPerformanceResultsAttained" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsForPerformanceResultsAttained" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsForActualPerformanceResultsWeightedAverageGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsForActualPerformanceResultsWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="cbz_IncrementalCommonSharesAttributableToStockOptions" abstract="false" name="IncrementalCommonSharesAttributableToStockOptions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cbz_IncrementalCommonSharesAttributableToRestrictedStockUnitsAndAwards" abstract="false" name="IncrementalCommonSharesAttributableToRestrictedStockUnitsAndAwards" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cbz_DilutiveSecuritiesIncludedAndAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" abstract="true" name="DilutiveSecuritiesIncludedAndAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="cbz_DilutiveSecuritiesIncludedAndAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" abstract="true" name="DilutiveSecuritiesIncludedAndAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cbz_CorporateAndEliminationsMember" abstract="true" name="CorporateAndEliminationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cbz_FinancialServicesMember" abstract="true" name="FinancialServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_BenefitsAndInsuranceServicesMember" abstract="true" name="BenefitsAndInsuranceServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_NationalPracticesMember" abstract="true" name="NationalPracticesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cbz_FacilityExpense" abstract="false" name="FacilityExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cbz_InterestRateSwapEffectiveApril2025Member" abstract="true" name="InterestRateSwapEffectiveApril2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
